Passability
From BAWiki
Definition
Passability refers to the unhindered passage of fish and benthic invertebrates from the entrance to the exit of a fishway. This should take place without any delay if possible.
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Source
Guideline Upstream Fishways on German Federal Waterways (AH FAA), Bundesanstalt für Wasserbau (BAW) und Bundesanstalt für Gewässerkunde (BfG), Version 2.0, 26/06/2015 (retrieved 10.05.2017)